#重口味 #激情 #黑髮 #刺激｜張旭微積分2020版(下)｜多變數函數的微積分｜重點六：二變數函數的偏微分｜精選範例 6-1｜數學老師張旭

Categories: Asian, Behind The Scenes, Hardcore, POV, Public, School (18+), Solo Male, Verified Amateurs, Vintage

Tags: chinese, class, outside, point-of-view, public, retro, teacher, university